川东平行岭谷区耕地的景观格局特征

Farmland Landscape Pattern Characteristics in Paralleled Ridge-valley of East Sichuan

为给川东平行岭谷区耕地利用与保护提供参考,以四川省渠县青龙乡为例,采用景观指数法分析耕地景观格局特征。结果表明:川东平行岭谷区耕地在不同地形条件下表现出不同的景观格局特征,在平地、坡度<6°和海拔<250m的水田景观贡献率大于旱地,水田对耕地的景观贡献率大于旱地,随着坡度或海拔高度增加,水田景观贡献率减小;水田、旱地均以小斑块聚集式分布为主,旱地景观整体比水田破碎,斑块几何形状比水田复杂。对阳坡、海拔250~300m、坡度2°~6°的水田和旱地以及坡度在6°~15°的旱地进行农地整理,以提高耕地利用效率;坡度>25°和海拔>350m的耕地应注重自然生态的改善。

The farmland landscape pattern characteristics in Qinglong Village,Qu County,Sichuan was analyzed by the landscape index method to provide a reference for farmland utilization and protection in paralleled ridge-valley of east Sichuan.Results：There is different landscape pattern characteristics in paralleled ridge-valley of east Sichuan because of different landform conditions.The landscape contribution rate of paddy field with flat ground,6°slope or 250 m altitude is higher than dry land and the landscape contribution rate of paddy field is more than dry land.The landscape contribution rate of paddy field decreases with increase of slope and altitude.The distribution pattern of paddy field and dry land is small patch aggregation mainly.The landscape of dry land is fragmentation and its patch geometrical shape is complex compared with paddy field overall.The paddy field with sunny aspect,250~300 maltitude and 2°~6°slope and dry land with 6°~15°slope should be consolidated to improve farmland utilization efficiency.The natural ecology should be paid more attention to for improvement of farmland with 25°slope or〉50 maltitude.